[RCSE] Manufacturing Design Decisions...
This is ultimately flying related, so I figure it meets the criteria of the alias, at least in some tangental way (less than one standard deviation from the norm). -Paul -- The US standard railroad gauge (width between the two rails) is 4 feet, 8.5 inches. An exceedingly odd number, is it not? So, why was that gauge used? Because that's the way they built them in England. The US railroads were designed by English expatriates. Why did the English build them like that? Because the first rail lines in England were built by the same people who designed the tramways them, and that's the gauge *they* used. Why did the English build the old tramways that way? Because the people who built the tramways used the very same jigs and tools they used for building the wagons, which used that wheel spacing. So why did wagons had that particular odd wheel spacing? Well, if they tried to use any other spacing, the wagon wheels would break on the old long-distance roads spanning England, due to the specific spacing between the ruts which are etched into the roads. Who built those old English rutted roads? The first long-distance roads in Europe (and England) were built by Imperial Rome for their legions. The roads have been used ever since. The ruts in the road were carved by Roman war chariots, which everyone else had to match, for fear of destroying their wagon wheels. So the US Railroad guage derives from the width a Roman war chariot. Specifications and bureaucracies live forever. Next time you are handed a spec, and wonder what horses ass came up with it, just know that it was some horse ass pulling an Imperial Roman War Chariot. Now the twist to the story.. The Space Shuttle has two big booster rockets attached to the sides of the main fuel tank. These are called SRBs (Solid Rocket Booster). The Space Shuttle's SRBs are made by Thiokol at their factory in Utah. The engineers who designed the SRBs would have preferred to give them a bit larger diameter, but the SRBs had to be shipped by train from the factory to the launch site. The railroad line from the factory runs through a tunnel in the mountains, and the SRBs had to fit through that tunnel. The tunnel is slightly wider than the railroad track, and the railroad track is about as wide as two horses' asses. So, a major design feature of what is arguably the world's most advanced transportation system was determined over two thousand years ago by some horse's ass. And you thought that reasoning only applied to the policies of Congress... RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
Re: [RCSE] Hera...BOOM ...oh my god! you killed Kenny!
This is part of the skill of flying: knowing where the edge of the envelope is, and getting as much of it as possible. If you ain't blown up a ship, you ain't flown. Trust me--I speak from experience ;-) ! Dana << Sam... perhaps a dumb question to the group. Why hasn't any of the many highly intelligent engineers in this sport developed load rated breakaway tow hook ? I quess the manufacturers of the planes would have to perform load failure crash test to determine the maximum tow load that their planes could take. Ideas anyone?? >> RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
[RCSE] a poll: recommendations for beginners clarification
I already got a number of answers! And it is clear that: A mentor is more important than 'brand-x' servos. There is no 'right' answer. In spite of this I want to explain that I am only hoping to see if there is what I would call 'statistical' consensus. With the incredible amount of combined experience and knowledge on this list, I have to believe that there would be a common denominator - setups that are generally agreed to work more often than not. I ask for a leap of faith - and not a discussion about 'balsa vs. foam' and 'definitive radio vs. 4-channel'. Call it like you see it - describe the specific system you think is most likely to be appropriate. As example I gave to actual cases - the wife wanting to buy a xmas present for the hubby, and a dad who wants to surprise their child. It is assumed that in all cases, the prospective flier is invited to watch and touch with our club... thanks a RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
[RCSE] 5-6% stab foil
"Not surprising. The 10% SD8020 is too thick for most glider tails. A slab airfoil is just plain bad. Both will surely have nonlinearities. A 5-6% thick airfoil with the max thickness point well forward at 20-25% chord is much better, since it is immune to most hysteresis effects. With such a tail I'm sure you'd see much less effect when changing decalage. -- - Mark Drela" Now that you have wetted our appetite what is your suggestion for that foil that I should be using?. Is it a special item or do I have it on file and don't even know it? Rick RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
Re: [RCSE] Fusible link
Yes, there is the rub. You have to know how strong the wing is by testing one to destruction or asking the manufacturer. If the manufacturer doesn't know or won't tell buy some other product. Then use the next smaller size of monofilament. Not all full house 2-meter wings are the same strength. The same can be said for 3-meter full house wings. BTW, the reduction in strength of the knots just provides a little safety factor. Regards, Ollie >Ahhh, there's the rub. How does one decide on a suitable breaking >strength? How much should one allow for knots in the monofilament? I >think this a grand idea, having folding more wings (1) than I ever wish >to repeat. What is a suitable desired breaking strength for: > >30 oz 2M full house plane? >full house 3M plane? > >Anyone?? > >Bill RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
RE: [RCSE] a poll: recommendations for beginners
NONE OF THE ABOVE.. I would invite the onlooker to fly the club glider on the buddy box and invite the onlooker to a club contest and club meeting. Then if the onlooker is still around he may have some idea of what he wants. By then he should know what a FLASH5, Hitec 555 even looks like. joe -Original Message- From: Antonio Martinez [mailto:[EMAIL PROTECTED]] Sent: Friday, March 10, 2000 4:05 PM To: [EMAIL PROTECTED] Subject: [RCSE] a poll: recommendations for beginners Although this is an often asked question, I am going to pose it one more time. I would like to gather 'votes' on the ideal setup for a beginner. If YOU were at your field flying, and an onlooker expressed interest, what COMPLETE SYSTEM would you recommend? For example "FLASH5, Hitec 555 w/HS-60's, brand x field charger, and a Highlander" etc... Obviously, durability and low cost are priorities. I'll be glad to post a final tally if I get enough replies. Please reply offline. thanks! a RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
Re: [RCSE] Bozo watched as Sams toy slipped into death.
On Fri, Mar 10, 2000 at 04:56:52PM -0700, Phil wrote: > Did Sam Get the toy he deserved??? Depends. Did he install that part? If so, then yes. An expensive lesson learned. If not, he got a raw deal. -- Tracy Reed http://www.ultraviolet.org RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
[RCSE] a poll: recommendations for beginners
Although this is an often asked question, I am going to pose it one more time. I would like to gather 'votes' on the ideal setup for a beginner. If YOU were at your field flying, and an onlooker expressed interest, what COMPLETE SYSTEM would you recommend? For example "FLASH5, Hitec 555 w/HS-60's, brand x field charger, and a Highlander" etc... Obviously, durability and low cost are priorities. I'll be glad to post a final tally if I get enough replies. Please reply offline. thanks! a RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
[RCSE] Bozo watched as Sams toy slipped into death.
The wind was 20 or so... the mono was not puttin up a big fuss...at least I could not hear it scream or creak from my vantage point(Base B turn around) . The wing let go just as the plane was about to enter the bucket. The wing simply cut loose of the fuse. My eyes were on the fuse since it was headed my way...I ducked as this missile screamed by my head. The fuse hit the ground behind me about 100 ft or so...shit that was close. I looked at the fuse after Sam gathered up the remnants. The Blind nut was installed upside down! No plywood either. It simply pulled thru the fuse. A simple mistake. I have to askWhen one installs a blind nut in a fuse without some kind of backer like ply or bass wood, just what will keep the "T" nut in place and spread the load? The poor thing was in a terrible "point load" condition. Failure was the only option left. Sorry about your toy Sam... Did Sam Get the toy he deserved??? Bozo says... -- Bozo says... "you get the plane you deserve" Phone 503 551 7030 RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
Re: [RCSE] Re:Hera...BOOM ...oh my god! you killed Kenny!
hehehe! - Original Message - From: James V. Bacus <[EMAIL PROTECTED]> To: RCSE <[EMAIL PROTECTED]> Sent: Friday, March 10, 2000 4:22 PM Subject: Re: [RCSE] Re:Hera...BOOM ...oh my god! you killed Kenny! > > There is a Hera, Starlite, Tango, etc.. that is the same molded F3J > sailplane with at least three different names. > > And then there are two completely different molded F3J sailplanes named the > Stork. > > Who is kidding who? 8-) > > > Jim > Downers Grove, IL > ICQ 6997780 > Visit my R/C Soaring Page at http://www.mcs.net/~bacuslab/soaring.html > > RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
Re: [RCSE] Re:Hera...BOOM ...oh my god! you killed Kenny!
There is a Hera, Starlite, Tango, etc.. that is the same molded F3J sailplane with at least three different names. And then there are two completely different molded F3J sailplanes named the Stork. Who is kidding who? 8-) Jim Downers Grove, IL ICQ 6997780 Visit my R/C Soaring Page at http://www.mcs.net/~bacuslab/soaring.html RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
Re: [RCSE] Fusible link
Hi all, I like Brian's method, it's normally called learning and knowing how to use your equipment, it's limits and it's draw backs. Pedal to the metal is not the most desirable way to launch any plane on a good, strong winch. Of course some of the bigger, heavier planes will need all, some winches will put out. Jerry Miller SOSS-Medford, OR RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
Re: [RCSE] Fusible link
>For about a dollar you can make a fusible link that will protect your wing >from folding on launch. It consists of a snap swivel, a welded ring and a >few inches of monofilament selected for the desired breaking strength. The >snap swivel connects to the ring on the end of the launch line and the >other ring goes on the tow hook with the break-rated momofilament connecting >them. It just takes a second to attach and another to detach after >retrieval. Many contestants will prefer to take the risks rather than the >penalty associated with a broken link. I think the FAI, in the early 80's, >considered this concept as an alternative to regulating winch power but >elected to regulate winches instead. >Regards, Ollie That why you use a close loop feed back system when launching. Use your eyes to detect the wing bending and lift your foot off the pedal to slow the winch down. When wing is ok, step on pedal again. Repeat as needed. end of program. Cost: free, 0.00 dollar Brian Chan, Trapped in the Jungle of Bureaucratic Lead Tape and Sinking. RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
Re: [RCSE] Fusible link
Oliver Wilson wrote: > > For about a dollar you can make a fusible link that will protect your wing > from folding on launch. It consists of a snap swivel, a welded ring and a > few inches of monofilament selected for the desired breaking strength. Ahhh, there's the rub. How does one decide on a suitable breaking strength? How much should one allow for knots in the monofilament? I think this a grand idea, having folding more wings (1) than I ever wish to repeat. What is a suitable desired breaking strength for: 30 oz 2M full house plane? full house 3M plane? Anyone?? Bill -- In theory, there is no difference between theory and practice, but in practice there is. Anon. Bill Johns Pullman, Washington RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
[RCSE] Ellipse 2 tipp!
Hello all! I know some don't like "wanted" request on this list but it is the only channel I could think of. I am looking for bashed up tipp panels for the Ellipse 2. Actually it is the carbon spar and possibly the root rib that I am looking for. I have some ideas that I want to try out by making my own tippanles as a glassed foam wing, and having the original carbon spar makes this much easier. Is there anyone out there that have something lying around and want top part with the stuff? -- Regards Erik Wikran Tromso, Norway --- RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
[RCSE] Fusible link
For about a dollar you can make a fusible link that will protect your wing from folding on launch. It consists of a snap swivel, a welded ring and a few inches of monofilament selected for the desired breaking strength. The snap swivel connects to the ring on the end of the launch line and the other ring goes on the tow hook with the break-rated momofilament connecting them. It just takes a second to attach and another to detach after retrieval. Many contestants will prefer to take the risks rather than the penalty associated with a broken link. I think the FAI, in the early 80's, considered this concept as an alternative to regulating winch power but elected to regulate winches instead. Regards, Ollie RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
RE: [RCSE] Jumping Diodes !
Yes it is necessary to jump the diode in the TX (providing there is one) if you want to use any type of smart charger. If you did not do this, the charger would not be able to read the voltage of the TX battery pack through the TX charge jack. You can eliminate the need to do this need by simply bypassing the charge jack and plugging the charger directly to the battery pack. You may need another connector or charge cord to do this. This means you have to disconnect the battery from the TX everytime you charge the battery which could theoretically reduce the reliability of that connection. The added measure of safety in doing this is that you eliminate the chance of a short in the charger or battery wires from destroying your transmitter due to a battery meltdown (something that has happened to several people on this list). I'll bet dollars to donuts that those who have suffered meltdowns due to wall-wart chargers did not have or bypassed the diode in their TX's. Someone else can jump in if they think it is better not to do this. Good Luck, Roy -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] Sent: Friday, March 10, 2000 6:43 AM To: [EMAIL PROTECTED] Subject: [RCSE] Jumping Diodes ! Fellow pilots- Just got my new Sirius Pro Charger, and read the part about "jumping" the diode. Their website shows nice pictures and instructions on how to do it. So, I opened the back of my Airtronics RD 6000 to take a look. Now I am hesitant to stick a soldering iron in there to add the jumper wire. Is this procedure absolutely necessary ? If so, I'll have to decide if I can do it or one of my electronic buddies. Thanks ! - JACK. RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
Re: [RCSE] Hera...BOOM ...oh my god! you killed Kenny!
Hmm... I didn't realize there were differences. Can you elaborate on these? I'm really curious. Also, Tom lists the Hera at $679 and Alberto lists the Tango at $849. -Ben [EMAIL PROTECTED] wrote: > > Sam, > That is a sad story, F3B can be tough on equipment especially with howling > wind and Hi-test line. In all fairness to the Hera it is a great airplane but > is designed for F3J, that is why it weighs 10 ounces less than an F3B Cobra. > That weight has to come out from somewhere. By the way, You do know that > there is a difference between Hera, Tango, and Starlight. Did you also know > that there is a light and heavy, and now the KC Hera. You and I both know > that you tried to save a few bucks and bought your TANGO from HobbyClub. I > would suggest that instead of trying to drag the HERA and Tom Copp into this > that you tell it like it is. This unfortunate outing was your first F3B > contest, under the conditions that you flew in, you destroyed your F3J > model. That is all there is to it, Why weren't you flying the Cobra you had > at our field in January. Larry > RCSE-List facilities provided by Model Airplane News. Send "subscribe" and >"unsubscribe" requests to [EMAIL PROTECTED] RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
Re: [RCSE] Decalage (was: Stab size)
Mark Drela wrote: > If changing the decalage on the glider DOES produce a noticable change in > handling, then one can conclude that the elevator response is nonlinear, > which indicates something bad and draggy is happening. Two instances of "bad and draggy behavior" were the same error in decalage on a couple very different ships. One was a foamy and the other was a stab-ele T-tail glass slipper. Both ships had too much decalage. Down elevator was needed to compensate for the excess decalage. This makes a terrible airfoil for creating the downward force needed especially at stable CG locations. Both ships howed terrible pitch sensitivity especially at low speeds. They would tend to dive for the ground or pitch up into a stall after applying elevator correction. What may have been happening is that the downward deflected elevator would stall under the pitching moment loads and let the nose drop sharply. Then when up elevator was applied the stab was suddenly able to apply enough force to raise the nose once the airflow reattached. The reattachment though was not prdictable due to hysteresis. So the poor pilot was left with a terrible handful to fly on landing approach. In both cases reducing the decalage helped tremendously. The lesson here may be that too much decalage is worse than not enough. The nutral trim airfoil resulting from too little decalage is much better for exerting downward force. John Hazel For the largest MP3 index on the Web, go to http://mp3.altavista.com RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
[RCSE] anyone going to the BASH from San Jose on the 17-19th weekend?
Hey folks. I am coming in from Maryland for a weekend of fun flying at Los Banos and was wondering if I could hook up with anyone heading down there. I travel light, but will have a box or two and a boomerang. Just checking before I rent a car. thanks Jason Werner RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
Re: [RCSE] Decalage (was: Stab size)
In theory this is correct. In reality the theory leaves a little to be desired - when working with very small static margins. Decalage is the last thing I tweak up when I'm trimming out a new fixed stab airplane. (Although sometimes if the decalage is way off it will need initial tweaking before the sweet CG spot can be found.) The final decalage tweak produces better turning and landing pitch stability. The hardest plane I ever tried to set up was a BOB hlg. The tail must have been 3 degrees off and when I finally got the decalage set the stab turned out to be too small. By the time I got it flying well it was pretty beat up so I trashed it. Very innovative construction tho. Guess its out of production now. Have you ever noticed that airplanes with all flying stabs tend to be the ones that are "classics" in terms of performance? (Sagitta, Bird of Time, Falcon 880) One of the prime features of each of these is the fact that decalage is always "right". Move the cg, adjust the trim and the plane still flies great. Fixed stabs require a bit more work when you get to aft cg's and small static margins. Rick (Voodoo Aerodynamicist) Eckel At 01:46 AM 3/10/00 -0500, Mark Drela wrote: >It seems to me that decalage is greatly oversold. Changing decalage simply >biases the elevator position, and can be entirely compensated via the elevator >trim >on the TX as long as the elevator deflection remains modest. There should be >no effect on handling. > >This is obvious on an all-flying tail... Increase the wing incidence >1 degree, and add 1 degree down elevator trim on the TX. The wing and tail >are at the same relative orientation as before, and the glider should fly as >before. >In a conventional hinged elevator, you'll have to add about 2 degrees of down >trim >for 1 degree of wing incidence, but again, the glider should fly as before, >even though 1 degree of "decalage" has been added. > >If changing the decalage on the glider DOES produce a noticable change in >handling, then one can conclude that the elevator response is nonlinear, >which indicates something bad and draggy is happening. Two possible >causes for tail nonlinearity are: > >1) The elevator deflection in trimmed flight is excessive ( > 5 degrees, say) >before or after the decalage change. Changing decalage to reduce this >deflection >will surely reduce the tail's profile drag. > >2) The horizontal tail has a crummy airfoil which suffers from hysteresis >or other flow pathologies. Such airfoils are usually draggy. A proper airfoil > >will eliminate this behavior and will reduce the profile drag as a bonus. > >If the tail response is linear and the handling doesn't change, then a minor >effect >of adding the 1 degree of wing incidence in the example above is that it lowers >the >angle of the fuselage by 1 degree. This may increase or decrease the fuselage >drag. >Another minor effect af adding 1 degree of wing incidence is to raise the tail >relative to the wing's wake. This is not an issue on most gliders, which have >the tail flying well above the wing's wake to begin with. > >- Mark Drela > > >RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] > RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
Re: [RCSE] Hera...BOOM ...oh my god! you killed Kenny!
Sam, That is a sad story, F3B can be tough on equipment especially with howling wind and Hi-test line. In all fairness to the Hera it is a great airplane but is designed for F3J, that is why it weighs 10 ounces less than an F3B Cobra. That weight has to come out from somewhere. By the way, You do know that there is a difference between Hera, Tango, and Starlight. Did you also know that there is a light and heavy, and now the KC Hera. You and I both know that you tried to save a few bucks and bought your TANGO from HobbyClub. I would suggest that instead of trying to drag the HERA and Tom Copp into this that you tell it like it is. This unfortunate outing was your first F3B contest, under the conditions that you flew in, you destroyed your F3J model. That is all there is to it, Why weren't you flying the Cobra you had at our field in January. Larry RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
[RCSE] Jumping Diodes !
Fellow pilots- Just got my new Sirius Pro Charger, and read the part about "jumping" the diode. Their website shows nice pictures and instructions on how to do it. So, I opened the back of my Airtronics RD 6000 to take a look. Now I am hesitant to stick a soldering iron in there to add the jumper wire. Is this procedure absolutely necessary ? If so, I'll have to decide if I can do it or one of my electronic buddies. Thanks ! - JACK. RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
Re[2]: [RCSE] Charging NiMH
Kev, It works, it is just that isn't copying or loading up when you double click. It may have something to do with the length of the address. Try eliminating everything after , or typing in the last few characters when you get the error message. That's what I did, and it worked. Ron Reply Separator Subject:Re: [RCSE] Charging NiMH Author: [EMAIL PROTECTED] Date: 3/10/00 12:50 AM Its still a dead link. Kev RONALD P KUKRAL wrote: > > > For some good reading on care and usage of NiMH, and Nicads, too, try the > following web page. It was posted here earlier in the week. It answered my > questions on charging NiMH batteries. > > Ron Kukral > SOAR Chicago > > http://data.energizer.com/batteryinfo/application_manuals/nickel_metal_hydride ..h > tm > RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "u nsubscribe" requests to [EMAIL PROTECTED] RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
RE: [Re: [RCSE] Yet another charger question...]
I use BOTH the Sirrus and Pico while the Sirrus is my work horse but it is SLOW. I LOVE that puppy it looks like no other charger. I have made it able to charge almost ANY battery any place! I use the MPX Pico to charge and the Sirrus to top off and condition this way I get the best of both worlds! Smooth Thermals, Karlton "MrMPX" Spindle http://www.MultiplexRC.com -Original Message- From: David Johnston [mailto:[EMAIL PROTECTED]] Sent: Thursday, March 09, 2000 8:35 PM To: Tom Broeski; Jones Philip; [EMAIL PROTECTED] Subject: Re: [Re: [RCSE] Yet another charger question...] Tom Broeski <[EMAIL PROTECTED]> wrote: I use a simple Multiplex Pico charger for all my receiver batteries and electric planes. 4,6,7,8 cells. It works great and is only $30. Karlton uses the same charger for all his planes. No, he doesn't! He has a VERY well used Sirius. Smooth air! -DJ Get free email and a permanent address at http://www.netaddress.com/?N=1 RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
[RCSE] Decalage (was: Stab size)
It seems to me that decalage is greatly oversold. Changing decalage simply biases the elevator position, and can be entirely compensated via the elevator trim on the TX as long as the elevator deflection remains modest. There should be no effect on handling. This is obvious on an all-flying tail... Increase the wing incidence 1 degree, and add 1 degree down elevator trim on the TX. The wing and tail are at the same relative orientation as before, and the glider should fly as before. In a conventional hinged elevator, you'll have to add about 2 degrees of down trim for 1 degree of wing incidence, but again, the glider should fly as before, even though 1 degree of "decalage" has been added. If changing the decalage on the glider DOES produce a noticable change in handling, then one can conclude that the elevator response is nonlinear, which indicates something bad and draggy is happening. Two possible causes for tail nonlinearity are: 1) The elevator deflection in trimmed flight is excessive ( > 5 degrees, say) before or after the decalage change. Changing decalage to reduce this deflection will surely reduce the tail's profile drag. 2) The horizontal tail has a crummy airfoil which suffers from hysteresis or other flow pathologies. Such airfoils are usually draggy. A proper airfoil will eliminate this behavior and will reduce the profile drag as a bonus. If the tail response is linear and the handling doesn't change, then a minor effect of adding the 1 degree of wing incidence in the example above is that it lowers the angle of the fuselage by 1 degree. This may increase or decrease the fuselage drag. Another minor effect af adding 1 degree of wing incidence is to raise the tail relative to the wing's wake. This is not an issue on most gliders, which have the tail flying well above the wing's wake to begin with. - Mark Drela RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
[RCSE] Passaj molded wing
I will post this here to cover the majority of requests for the Passaj. Thanks for all the interest on the Passaj wings. The wings are made in hard female molds with a solid 2 lb foam core. You need to cut and hinge the ailerons yourself. Fit 2 wing servos and linkage, put your radio into the wing root, cover and bond on the winglets. The wing comes in 2 pieces you fit the radio in the root. It has a carbon fiber wing rod. Slide the wing together and tape the joint and fly! It breaks down into a small package for transport and if you bolt on the winglets you can easily pack it to carry almost everywhere. I just ran out. I will place an order tomorrow for Passaj and Aldi j models. I should have them in 3 to 4 weeks. Tom Copp COMPOSITE SPECIALTIES http://www.f3x.com RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
Re: [RCSE] COOL new Way to interface your TX
The Profi 4000 has its own program (so old it is in German DOS). The 3000 series does not have a PC interface as of yet :) Smooth Thermals, Karlton Spindle http://www.MultiplexRC.com - Original Message - From: Rick Wardrop <[EMAIL PROTECTED]> To: Karlton Spindle <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]> Sent: Thursday, March 09, 2000 4:33 PM Subject: Re: [RCSE] COOL new Way to interface your TX > Are similar programs available for the 3000 and 4000 series transmitters or > does this one program "fit all"? > > Rick, > > RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] > RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
Re: [RCSE] Winter in CA, summer in Duluth, MN, lately
Tom--Several of us in Birmingham are flying slope but we dont have a dam to fly off of. Where is your dam and what is the landing problem? We are not into catching them with our hands!! Our sites are for the most part const. sites and will not be with us long. The best requires a NW wind and we dont get much of that here.TIAJimAt 06:49 PM 3/9/00 -0500, Tom Long wrote: >Hi Al, >It was interesting to see this post and know that you are still in Duluth, >MN. We are still flying at the same field in Duluth, GA and enjoying a very >mild winter that has provided a lot of good flying weather. We have been >doing a lot more slope soaring at our dam site in Georgia and we've come to >believe that it is actually one of the best slope soaring sites around -- if >you can overlook the problems with landing. However, the EPP planes survive >very well. We will be glad to welcome you to our thermal field and our Dam >site any time you can work a trip to Georgia. Glad to hear you are having >good success with your HLG. >Tom Long >-Original Message- >From: Albert Nephew <[EMAIL PROTECTED]> >To: [EMAIL PROTECTED] <[EMAIL PROTECTED]> >Date: Wednesday, March 08, 2000 1:32 PM >Subject: [RCSE] Winter in CA, summer in Duluth, MN, lately > > >>On March 5, 2000 the Craft Family, perhaps in the person of Jerry, >>reported the following about the previous day: >> >>>Subject: SoCal Tehachapi F3F Race Results >> >>>The drizzle stopped around 11:30am, but now there was this >>fluffy white stuff falling from the sky. 15 minutes later, we noticed >>all >>the cars in the parking lot were the same shade of white. After >>taking >>a couple of pictures and a very brief snowball fight, we decided we >>had better get off the mountain while we still could. >> >>MEANWHILE, in Duluth, Minnesota, famous for supplying lots of good >>building and hanger flying weather at this time of year-- to wit: >> >>Average high temp for March 4: 27 degrees F (-3 degrees C); >>Typical average snow depth March 4: 24 inches (60 cm); >>Typical ice thickness on local lakes: 18 inches (45 cm)--takes about a >>foot of ice to safely drive on it, and around here we have official ice >>roads in the winter; >>It's usually a winter camping heaven; >> >>BUT LATELY: >> >>March 4, 2000, conditions: high 60 degrees F (16 degrees C); no snow on >>the ground, and there hasn't been any since about Feb. 23, soon after >>the Big Warmup started; vehicles are staying off the ice or they are >>going through. Local HLG addicts were driving their Sunbirds all over >>the sky Saturday. They were happy. >> >>YESTERDAY (March 7) this HLG addict took advantage of the 70 degree, >>all sunshine, no clouds, humidity in the 20s, no wind except that being >>sucked into the boomer thermals, no snow on the ground, weather to find >>a couple of hours between classes and meetings to drive that Sunbird >>around the sky again, in shorts and a t-shirt (me, not the Sunbird), >>getting a need for a hit of adrenaline satisfied, and some suntan as >>well. >> >>Incidentally, the 70 degree high was an all-time high for the date, and >>the earliest 70 degrees ever in March here, the previous earliest date >>being March 22, 1945. (The all-time low was -20 for the date, in case >>you yearn to know.) >> >>The sight of a florescent pink Sunbird (light spray dusting on Model >>Research Labs mylar as supplied by Ray with the Sunbird if desired) >>climbing in a thermal on a sunny day is good for the soul. Thanks for >>the Sunbird, Dave Thornburg and Ray Hayes! >> >>I'll bet that all over the upper midwest there are glider guiders who >>feel temporarily thermal satisfied after the recent weather. >> >>Today it is raining hard, including thunderstorms--has been for >>hours--and tonight it is supposed to snow four to eight inches, so >>perhaps we will get our skiing back. >> >>And so it's back to the hanger, where the memories will continue to >>soar on the thermals. >> >>Al Nephew >>Duluth, MN >>USA >>RCSE-List facilities provided by Model Airplane News. Send "subscribe" and >"unsubscribe" requests to [EMAIL PROTECTED] > >RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] > RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
Re: [RCSE] DS....my stupid question
Y.K., I just learnt to DS 2 days ago, it is so exciting! it really push your plane to its limit. I have totally lost interest to fly in the front. Raymond Wong Hong Kong "Y.K.Chan" wrote: > Why do some go DS? > > related questions > Is it by choice or that is the only way soaring may be practiced > at a give site and condition? > > YK Chan > Seattle area. > > RCSE-List facilities provided by Model Airplane News. Send "subscribe" and >"unsubscribe" requests to [EMAIL PROTECTED] RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
Re: [RCSE] the wing is the thing!!
thanks all for your answers about wings for multiple uses. Rodger - Original Message - From: "Moved by the wind." <[EMAIL PROTECTED]> To: "Rodger Hamer" <[EMAIL PROTECTED]> Cc: <[EMAIL PROTECTED]>; "Charles Miller" <[EMAIL PROTECTED]>; "Soaring listserver" <[EMAIL PROTECTED]> Sent: Friday, March 10, 2000 1:37 AM Subject: Re: [RCSE] the wing is the thing!! > > > Rodger Hamer wrote: > > > thanks, > > Is there a wing, etc that can thermal also? > > I just bought a set of Windlord plans from Model Aviation plan # 215. It's a plank wing 100" span 1400 squares from '79 designed by > Ken Bates, I saw Jim Ealy fly his a couple of times in the '80s always wanted one afterwards. I also the Raven 2M plans my friend > Len Bulfone gave me, it flew well also. 2M span with 988 squares designed by Dave Jones, plans from Western Plan Service. Bill > Evans Simitar also flies well. > > Rich B > > RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
Re: [RCSE] Hera...BOOM ...oh my god! you killed Kenny!
>The towhook survived, it's a pretty nice one too :-) > >Sam Girardi Hey wasn't there someone looking for a tow hook for his model Eddie RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
